Preamplifier Schematic
 
    RIAA Stage
  • R1 - 47k Vishay S102
  • R2,3 - 33R
  • R4 - 220R
  • R5 - 10k
  • R6 - 470R
  • R7 - 470k
  • R8 - 47R
  • R9 - 150k//383k Holco H8 + 12k for low Z driver
  • R11 - 1M//16k2 Holco H8
  • R12 - 1M
  • R14 - 330R
  • R15 - 47k Resista MK8
  • R16 - 1k8
  • R17 - 4k7
  • C1 - 150u 350V Black Gate
  • C2 - 0.47u Sidereal (0.47u Crescendo if mu follower stays)
  • C3 - 2 x //10n 630v Suflex polystyrene
  • C4 - 6n8 630v Suflex polystyrene
  • C5 - 0.1u North Crescendo
  • C6 - 1u North Crescendo
  • C7 - 150u 350V Black Gate
  • V1 - 6SL7 JAN Sylvania NOS
  • V2 - 1/2 5965 Mullard
  • V3 - 1/2 6072 GE/LEAR brand
    Output Stage
  • VR1 - 50k Alps blue potentiometer
  • R13 - 1k1
  • R18 - 100k Holco H2
  • R19 - 100k Holco H2
  • R20 - 100k Holco H2
  • R23 - 100R
  • R24 - 4k7 + 4k7
  • R25 - 470k
  • C8 - 1u North Crescendo
  • C9 - 150u 350V Black Gate
  • C10 - 22u 350V Black Gate
  • C11 - 22u Ansar
  • T1 - 2N2907A
  • T2 - MJE350 on heatsink
  • D1,2 - Red LED
  • D3 - Red LED
  • V4 - 6922 Sovtek

All resistors Maplin metal film unless stated otherwise. Planned replacements in ()

 
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